Stove-pipe damper



A. v. e A. F. FLETCHER. Stove Pipe Damper. N0` 48,058. Patented )une 6.I1865.

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UNITED STATES `PATENT OFFICE.

A. VQ FLETCHER :AND A. F. FLETCHER, OF ATHOL, MASSACHUSETTS.

STOVE-PIPE DAMPER.

Specification forming part of Letters Patent No. 18.058, dated June 6,1865.

.To all whom, t may concern,.-

Be it known that we, A. V. FLETCHER and A. F. FLETCHER, of Athol, inthecounty of W'orcester and State of Massachusetts, have invented a new andImproved Stove-Pipe Damper; and we do hereby declare that the followingis a full, clear, and exact description thereof, which will enable thoseskilled in the art to make and use the same, reference being had to' theaccompanying drawings, forming part of this specification, in which-Figure 1 is a plan view of one side of our damper. Fig. 2 is a centralsection taken in the linem x, Fig. 1. Fig. 3 is a view of a portion ofthe frame of the damper.

Similar letters of, reference indicate corre- I sponding parts.

The object oi' this invention is to provide a damper capable of closingthe entire area across the pipe when in one position, land when in areverse position, to afford a free escape for the smoke, and at the sametime prevent as much as possible of the heat from escaping upthechimney.

Our invention consists in the application to a circular frame of a diskou the one side, so arranged that when the said frame is turned in onepositionthe smoke ascending from the stove will cause it to hug closelythereto and prevent the passage of the smoke to the chimney; but whenturned in an opposite direction it will fall away from the frame andpermit the smoke to pass away into the chimney.

It also consists in attaching to the opposite side of the frame a spiralcoil of strips of metal,

so arranged that the smoke in passing through u the damper will acquirea circular motion, thus economizing the heat that usually accompaniesit, as well as to present a barrier against a free escape of the heatwhen the smoke is ascending from the stove or other heater.

To enable others to make and use our invention, we will proceed todescribe it.

A represents the frame ofthe damper, which is beveled to ward the ycenter for the more ready adaptation of the devices we shall pres.-ently describe. a `is a pivot on the one side for holding the damper inthe pipe B, and b the pivot on the 4other side, and C the knob by whichto turn the damper. D (see Fig.

3) is a piece extending across the opening in the frame A, and is casttherewith or otherwise secured to it.

On one side of this frame A to the crosspiece D there is attached acoil, E, one of its ends being secured thereto. This coil is representedas being cut out of a plain circular piece of 4sheet `metal bycommencing the incision at the circumference and running it inwardtoward the center, forming a spiral, which is represented in its closedor compressed state in Fig. 1 and in its extended state in Fig. 2. Onthe opposite side of this frame we iit a disk, F, which has its outwardedges bent inward, so as the-more closely to iit to the inner bevel ofthe frame A. This disk is made of a size to fully cover the opening inthe frame A, and it is attached to the cross-piece D by a pin, c,running through its center. This pin is long enough to allow the disk Fto fall sufiiciently far from the frame A to permit a free passage forthe smoke when the damper is turned with its coil side toward the stoveor heater, and to allow it to press up close to the frame A when it isdesired to shut off or close the opening through the pipe, and consequently the draft.

From the above description it will be seen that by turning the damperwith its spiral portion toward the stove the smoke-will assume acircular motion when passing around the said coil in its escape, andthus insure a `greater radiation of `heat than would occur were thespace left open, or partially so, and the disk on the opposite side,while the damper is yet in the same position,will further :restrain thesmoke, but finally allow it to creep out around its edge, and fromthence it passes on toward the chimney, and that by turning the damperin an opposite direction-that is, with the disk to ward the stove-thesmoke or heated A. V. FLETCHER. A. F. FLETCHER.

Vitnesses:

RUFUs PUTNAM, Cris. FIELD.

